Lamp-chimney



E. J. HALE.

Lamp Cap. No. 25,406. Patented Sept. 13, 1859.

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UNITED STATES PATENT OFFICE.

ELIAS J. HALE, OF FOXGROF'I, MAINE.

LAMP- CHIMNEY.

Specification of Letters Patent No. 25,406, dated September 13, 1859.

To all whom it may concern:

Be it known that I, ELIAs J. HALE, of Foxcroft, in the county of Piscataquis and State of Maine, have invented an Improvement in Chimneys for Lamps; and I do hereby declare that the same is fully described and represented in the following specifications and the accompanying drawings, in which Figure 1 is the entire chimney, Fig. 2 a glass or metallic tube forming the top of the chimney, Fig. 3 a glass bulb or globe with tubular terminations, is the lower part of the chimney, Fig. 4 a metallic cylinder or band, Fig. 5 a top view of the metallic cylinder or band together with the flange.

My present invention has for its object to prevent the chimney of a lamp from being clouded by the smoke which rises from the flame, and which generally comes into contact with the inner surface of the chimney;

and consists in forming in the chimney at a point above the flame a contraction which will centralize the ascending current of hot air; and in connection therewith admitting at or near this same point a current of air which may rise in contact with the inner surface of the chimney and prevent the contact of the smoke with this surface above,

the throat or contractionwhile the said throat or contraction will act to draw the smoke away from the surface of the chimney at all points below it.

In carrying out this invention the lower part of the chimney B which is a glass bulb or hollow globe with tubular terminations enters at its upper terminus the lower end of the metallic cylinder or band C. The glass tube A, or upper part of the chimney enters at its lower terminus the upper part of the metallic cylinder C; when united the entire chimney is formed. Vithin the metallic cylinder C, is the flange D, by which the transverse area of the chimney in that region is very much diminished an orifice being left in the center.

e, represents the air holes.

This invention accomplishes very important results. The diminution of the area of the chimney at the flange increases the velocity of the current ascending to this narrow throat, while at the same time every portion of said current necessarily converges nearly to a point in order to pass this narrow orifice, by means of which convergence the internal surface of the lower part of the chimney is relieved entirely from contact with the smoke and remains completely unclouded and entirely clean. The upper sec tion of the chimney is not tarnished by the smoke (however much there may be) for the external air rushing through the orifices in the circumference of the metallic cylinder centralizes the ascending current, while that portion of the area of the chimney which is near the circumference is supplied with and occupied by fresh air admitted through the small orifices aforesaid. In the common chimney a current of smoke from the flame of the lamp soon beclouds the chimney so that cleaning becomes absolutely necessary. The same quantity of smoke in my chimney will produce no visible effect, though continued for a great length of time. Again the new chimney from the fact that the heated current is always in the center of the chimney and not in contact with it, and from the fact that the glass is in two sections which become unequally heated is much less liable to fracture; further when it does become necessary to clean this chimney the process is much more easily and speedily performed than when the chimney is one entire tube.

hat I claim as my invention and desire to secure by Letters Patent is- Contracting the chimney above the fiam and admitting at or near the same point a current of air in the manner and for the purpose substantially as herein set forth.

In testimony whereof I have hereunto set my signature.

ELIAS J. HALE. Vitnesses:

AUeHs'rUs HALE, HENRY C. PRENTISS. 

